221401463 has 2 divisors, whose sum is σ = 221401464. Its totient is φ = 221401462.

The previous prime is 221401423. The next prime is 221401469. The reversal of 221401463 is 364104122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221401463 - 2¹⁴ = 221385079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221401469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700731 + 110700732.

It is an arithmetic number, because the mean of its divisors is an integer number (110700732).

Almost surely, 2^221401463 is an apocalyptic number.

221401463 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401463 is an equidigital number, since it uses as much as digits as its factorization.

221401463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 221401463 is about 14879.5652826284. The cubic root of 221401463 is about 604.9602350751.

Adding to 221401463 its reverse (364104122), we get a palindrome (585505585).

The spelling of 221401463 in words is "two hundred twenty-one million, four hundred one thousand, four hundred sixty-three".